insurance_least_squares
  c1       = -12052.5
  c2 (age) = 257.735
  c3 (sex) = -128.64
  c4 (bmi) = 322.364
  c5 (kid) = 474.411
  c6 (smo) = 23823.4

  Sum-of-squares error = 4.9073e+10
quit